Harrison District officers were called to the area around Franklin Boulevard and Central Park Avenue in East Garfield Park about 4:30 a.m. Sunday after receiving a call of shots fired, police said. A witness pointed at a car, saying a man inside had a "big" gun, authorities said.

Police pulled the car over on Central Park just south of Chicago Avenue and two officers approached with guns drawn, authorities said. The driver straightened up and pointed a sawed-off shotgun at the officer, who fired two shots and wounded Jackson in the arm, police said.

Jackson has been charged with unlawful use of a weapon, aggravated assault on a police officer, possession of a controlled substance and three misdemeanors. He is expected in bond court today.

In a second incident Sunday, an off-duty police officer shot someone who pointed a gun at him near the intersection of South Oakley Boulevard and West Van Buren Street, a police union spokesman said.

Attorneys for a motorist who was fatally shot by two Chicago police officers told a federal jury Tuesday that the officers lied on the witness stand last week and had no legal justification to pull him over shortly before the deadly confrontation.